233 lines
8 KiB
C
233 lines
8 KiB
C
#include <stdio.h>
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#include <freertos/FreeRTOS.h>
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#include <freertos/task.h>
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#include <freertos/semphr.h>
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#include <unity.h>
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#include <test_utils.h>
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#include <esp_spi_flash.h>
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#include <esp_attr.h>
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#include <esp_flash_encrypt.h>
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#include <string.h>
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#ifdef CONFIG_SECURE_FLASH_ENC_ENABLED
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static void test_encrypted_write(size_t offset, const uint8_t *data, size_t length);
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static void test_encrypted_write_new_impl(size_t offset, const uint8_t *data, size_t length);
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static void verify_erased_flash(size_t offset, size_t length);
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static size_t start;
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static void setup_tests(void)
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{
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if (start == 0) {
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const esp_partition_t *part = get_test_data_partition();
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start = part->address;
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printf("Test data partition @ 0x%x\n", start);
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}
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}
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TEST_CASE("test 16 byte encrypted writes", "[flash_encryption][test_env=UT_T1_FlashEncryption]")
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{
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setup_tests();
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TEST_ASSERT_EQUAL_HEX(ESP_OK,
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spi_flash_erase_sector(start / SPI_FLASH_SEC_SIZE));
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uint8_t fortyeight_bytes[0x30]; // 0, 1, 2, 3, 4... 47
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for(int i = 0; i < sizeof(fortyeight_bytes); i++) {
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fortyeight_bytes[i] = i;
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}
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/* Verify unaligned start or length fails */
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TEST_ASSERT_EQUAL_HEX(ESP_ERR_INVALID_ARG,
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spi_flash_write_encrypted(start+1, fortyeight_bytes, 32));
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TEST_ASSERT_EQUAL_HEX(ESP_ERR_INVALID_SIZE,
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spi_flash_write_encrypted(start, fortyeight_bytes, 15));
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/* ensure nothing happened to the flash yet */
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verify_erased_flash(start, 0x20);
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/* Write 32 byte block, this is the "normal" encrypted write */
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test_encrypted_write(start, fortyeight_bytes, 0x20);
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verify_erased_flash(start + 0x20, 0x20);
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/* Slip in an unaligned spi_flash_read_encrypted() test */
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uint8_t buf[0x10];
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spi_flash_read_encrypted(start+0x10, buf, 0x10);
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TEST_ASSERT_EQUAL_HEX8_ARRAY(fortyeight_bytes+0x10, buf, 16);
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/* Write 16 bytes unaligned */
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test_encrypted_write(start + 0x30, fortyeight_bytes, 0x10);
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/* the 16 byte regions before and after the 16 bytes we just wrote should still be 0xFF */
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verify_erased_flash(start + 0x20, 0x10);
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verify_erased_flash(start + 0x40, 0x10);
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/* Write 48 bytes starting at a 32-byte aligned offset */
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test_encrypted_write(start + 0x40, fortyeight_bytes, 0x30);
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/* 16 bytes after this write should still be 0xFF -unencrypted- */
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verify_erased_flash(start + 0x70, 0x10);
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/* Write 48 bytes starting at a 16-byte aligned offset */
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test_encrypted_write(start + 0x90, fortyeight_bytes, 0x30);
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/* 16 bytes after this write should still be 0xFF -unencrypted- */
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verify_erased_flash(start + 0x120, 0x10);
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}
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static void test_encrypted_write(size_t offset, const uint8_t *data, size_t length)
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{
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uint8_t readback[length];
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printf("encrypt %d bytes at 0x%x\n", length, offset);
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TEST_ASSERT_EQUAL_HEX(ESP_OK,
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spi_flash_write_encrypted(offset, data, length));
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TEST_ASSERT_EQUAL_HEX(ESP_OK,
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spi_flash_read_encrypted(offset, readback, length));
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TEST_ASSERT_EQUAL_HEX8_ARRAY(data, readback, length);
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}
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TEST_CASE("test 16 byte encrypted writes (esp_flash)", "[flash_encryption][esp_flash_enc][test_env=UT_T1_FlashEncryption]")
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{
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setup_tests();
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TEST_ASSERT_EQUAL_HEX(ESP_OK,
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spi_flash_erase_sector(start / SPI_FLASH_SEC_SIZE));
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uint8_t fortyeight_bytes[0x30]; // 0, 1, 2, 3, 4... 47
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for(int i = 0; i < sizeof(fortyeight_bytes); i++) {
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fortyeight_bytes[i] = i;
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}
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/* Verify unaligned start or length fails */
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TEST_ASSERT_EQUAL_HEX(ESP_ERR_INVALID_ARG,
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esp_flash_write_encrypted(NULL, start+1, fortyeight_bytes, 32));
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TEST_ASSERT_EQUAL_HEX(ESP_ERR_INVALID_SIZE,
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esp_flash_write_encrypted(NULL, start, fortyeight_bytes, 15));
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/* ensure nothing happened to the flash yet */
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verify_erased_flash(start, 0x20);
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/* Write 32 byte block, this is the "normal" encrypted write */
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test_encrypted_write_new_impl(start, fortyeight_bytes, 0x20);
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verify_erased_flash(start + 0x20, 0x20);
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/* Slip in an unaligned esp_flash_read_encrypted() test */
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uint8_t buf[0x10];
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esp_flash_read_encrypted(NULL, start+0x10, buf, 0x10);
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TEST_ASSERT_EQUAL_HEX8_ARRAY(fortyeight_bytes+0x10, buf, 16);
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/* Write 16 bytes unaligned */
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test_encrypted_write_new_impl(start + 0x30, fortyeight_bytes, 0x10);
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/* the 16 byte regions before and after the 16 bytes we just wrote should still be 0xFF */
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verify_erased_flash(start + 0x20, 0x10);
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verify_erased_flash(start + 0x40, 0x10);
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/* Write 48 bytes starting at a 32-byte aligned offset */
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test_encrypted_write_new_impl(start + 0x40, fortyeight_bytes, 0x30);
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/* 16 bytes after this write should still be 0xFF -unencrypted- */
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verify_erased_flash(start + 0x70, 0x10);
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/* Write 48 bytes starting at a 16-byte aligned offset */
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test_encrypted_write_new_impl(start + 0x90, fortyeight_bytes, 0x30);
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/* 16 bytes after this write should still be 0xFF -unencrypted- */
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verify_erased_flash(start + 0x120, 0x10);
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}
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static void test_encrypted_write_new_impl(size_t offset, const uint8_t *data, size_t length)
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{
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uint8_t readback[length];
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printf("encrypt %d bytes at 0x%x\n", length, offset);
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TEST_ASSERT_EQUAL_HEX(ESP_OK,
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esp_flash_write_encrypted(NULL, offset, data, length));
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TEST_ASSERT_EQUAL_HEX(ESP_OK,
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esp_flash_read_encrypted(NULL, offset, readback, length));
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TEST_ASSERT_EQUAL_HEX8_ARRAY(data, readback, length);
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}
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static void verify_erased_flash(size_t offset, size_t length)
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{
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uint8_t readback[length];
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printf("verify erased 0x%x - 0x%x\n", offset, offset + length);
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TEST_ASSERT_EQUAL_HEX(ESP_OK,
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spi_flash_read(offset, readback, length));
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for (int i = 0; i < length; i++) {
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char message[32];
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sprintf(message, "unerased flash @ 0x%08x", offset + i);
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TEST_ASSERT_EQUAL_HEX_MESSAGE(0xFF, readback[i], message);
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}
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}
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TEST_CASE("test read & write random encrypted data", "[flash_encryption][test_env=UT_T1_FlashEncryption]")
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{
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const int MAX_LEN = 192;
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//buffer to hold the read data
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WORD_ALIGNED_ATTR uint8_t buffer_to_write[MAX_LEN+4];
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//test with unaligned buffer
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uint8_t* data_buf = &buffer_to_write[3];
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setup_tests();
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esp_err_t err = spi_flash_erase_sector(start / SPI_FLASH_SEC_SIZE);
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TEST_ESP_OK(err);
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//initialize the buffer to compare
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uint8_t *cmp_buf = heap_caps_malloc(SPI_FLASH_SEC_SIZE, MALLOC_CAP_32BIT | MALLOC_CAP_8BIT | MALLOC_CAP_INTERNAL);
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assert(((intptr_t)cmp_buf % 4) == 0);
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err = spi_flash_read_encrypted(start, cmp_buf, SPI_FLASH_SEC_SIZE);
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TEST_ESP_OK(err);
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srand(789);
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uint32_t offset = 0;
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do {
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//the encrypted write only works at 16-byte boundary
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int skip = (rand() % 4) * 16;
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int len = ((rand() % (MAX_LEN/16)) + 1) * 16;
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for (int i = 0; i < MAX_LEN; i++) {
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data_buf[i] = rand();
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}
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offset += skip;
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if (offset + len > SPI_FLASH_SEC_SIZE) {
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if (offset > SPI_FLASH_SEC_SIZE) {
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break;
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}
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len = SPI_FLASH_SEC_SIZE - offset;
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}
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printf("write %d bytes to 0x%08x...\n", len, start + offset);
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err = spi_flash_write_encrypted(start + offset, data_buf, len);
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TEST_ESP_OK(err);
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memcpy(cmp_buf + offset, data_buf, len);
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offset += len;
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} while (offset < SPI_FLASH_SEC_SIZE);
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offset = 0;
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do {
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int len = ((rand() % (MAX_LEN/16)) + 1) * 16;
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if (offset + len > SPI_FLASH_SEC_SIZE) {
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len = SPI_FLASH_SEC_SIZE - offset;
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}
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err = spi_flash_read_encrypted(start + offset, data_buf, len);
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TEST_ESP_OK(err);
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printf("compare %d bytes at 0x%08x...\n", len, start + offset);
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TEST_ASSERT_EQUAL_HEX8_ARRAY(cmp_buf + offset, data_buf, len);
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offset += len;
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} while (offset < SPI_FLASH_SEC_SIZE);
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free(cmp_buf);
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}
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#endif // CONFIG_SECURE_FLASH_ENC_ENABLED
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